package com.skycode5.servlet;


import com.skycode5.bean.NewsBean;
import com.skycode5.dao.NewsDao;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet("/news.jsp")
public class NewsServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String p = req.getParameter("page");
        int page = 1;
        if (p != null && p.equals("")) {
            page = Integer.parseInt(p);
        }
        // 1.获取新闻信息
        NewsDao newsDao = new NewsDao();
        List<NewsBean> news = newsDao.getList();
        //给用户总条数 当前页数 总页数 上一页 下一页
        int totalCount,curPage,totalPage = 0,upPage,downPage;
        totalCount = newsDao.count();//总条数
        curPage = page;//用户传递进来的页码
        if (totalPage%10 ==0){
            totalPage = totalCount/10;
        }else {
            totalPage = totalCount / 10 + 1;//计算总页数
        }
        //上一页 当前页数减去1
        if (curPage==1){
            upPage = 1;
        }else {
            upPage = curPage-1;
        }
        if (curPage==totalPage){//当前页和总页数相同下一页不+1
            downPage = totalPage;
        }else {
            downPage = curPage+1;
        }
        req.setAttribute("curPage",curPage);
        req.setAttribute("totalPage",totalPage);
        req.setAttribute("totalCount",totalCount);
        req.setAttribute("upPage",upPage);
        req.setAttribute("downPage",downPage);
        // 2.传递新闻信息给前端页面
        req.setAttribute("news",news);
        // 3.加载显示前端页面
        req.getRequestDispatcher("newstemp.jsp").forward(req,resp);
    }
}